Signaling apparatus for telephone toll-lines.



No. 833,907. PATENTED OCT. 23, 1906. J. G. WRAY, H. T. GARDNER & W. G.KINTON. .SIGNALING APPARATUS FOR TELEPHONE TOLL LINES.

APPLICATION FILED JULY 3, 1905.

2 SHBETSSHBET 1 INVENTORJ, A? 3%- g 7 BY 11%; l K

ATTORNEY. A

WITNESSES No. 833,907. PATENTED OCT. 23, 1906.

' J. G. WRAY, H. T. GARDNERK; W. G. KINTON.

SIGNALING APPARATUS FOR TELEPHONE TOLL LINES.

APPLIOATION FILED JULY 3. 1905.

' 2 siums-snfl z.

INVENTORJ,

ATTORNEY.

WITNESSES.-

* UNITEDSTATES PATENT OFFICE.

- JAMES e. WRAY, OF CHICAGO, HERBERTT. GARDNER. F MAYWOOD, AND WILLIAMG. KINTONQOF cnioAco, ILLINOIS, AssIeNoRs TO phone-exchange system, andis mainly em- AMERlCAN TELEPHONE AND T TION OF NEW YORK.

To all whom it may concern:

Be it known that we, JAMES'G. WRAY, residing at Chicago, HERBERT T.GARDNER, residing at Maywood, and WILLIAM 'G. KINTON,

residing at ()hicago,in the county of Cook and State of Illinois, haveinvented certain Improvements in Signaling'Apparatus for TelephoneToll-Lines, of which the following is a specification. I

The present invention relates to a telebodied in thecall signalingandsupervisory 1signaling devices used in connection with tolllnes. r Inaccordance with the invention the call signaling system for thestation'wanted is. 0

the party-lines and the signals branched.

from oppositesides of the line to a third'conductor or groundconnection, while the springjack connections are reversed, so that'intwoparty lines no change ofdirection in the signaling-current isrequired.

In connection with four-party lines th I two signals which are branchedfrom; the

same side of the line are arranged to respond to pulsating currentsflowing in opposite directions, and an electromagnetic pole-changing:switch is employed at the called central.

station, which is under the control of a key at said station. i

The supervisory signals are so arranged as to cause the signal at thecalling central station to be displayed when the connection is made withthe called station and to be retiredwhen the called subscriber takesdown his receiver. At the called central station the supervisory signalis displayed upon the insertion of the plug in the 'ack at thecallingstation and retired upon t e insertion of the plug in the ack ofthe called subscribers line. When conversation has been finished and thecalled subscriber has-hung up his receiver, the supervisory signal isdisplayed at the Specification of Letters Patent.

Application filed July 3, 1905. Serial No. 268,216-

phone at station N, and asks ment of a trunk. Assuming that the trunkELEGRAPH" GOMPAN Y, A CORPORA- SIGNALING-APPARATUS Fon' TELEPHONETOLL-LINES.

iatented Oct. 23, 1906.

called central station is displayed and is finally retired upontheremoval of the plug at the latter station. i r s Figure 1 is a diagramof the cord-circuit at the calling central station or toll operatorsstation, and Fig. 2 is a diagram of the cordcircuit at the calledcentral station where the wanted subscribers line is connected. It is tobe understood in tracing the circuits, in connection with the followingdescription, thatthe conductors a and a and b and b? in calling centralstation, and u on the removal 1 of the. plug at that station t e signalat the Fig. 2 are continuations, respectively, of. the

tion operators and the subscribers will be.

followed, beginning with the part performed by the toll operator afterreceiving a call for connection with a substation at another centralstation. x

The toll operators station, which willbe herelnafter designated asstation M, is shown in Fig. 1. Upon receiving a call fora subscriberWhose line is connected with another central station, such as that shownin Fig. 2 and hereinafter referred to as station N, the operator atstation M first presses the .key a, connecting her telephone, throughthe conductors a" and (1, with the o erators telefbr the assignrepresented by the. conductors b" and b and the cord set shown in Fig. 2is the one as-. signed, the operator at station-M places the plug A inthe jack A thereby connecting her cord SGfl'WltlI the cord set atstation N. This establishes a circuit supplied-with current from thebatter-v B at station N, which circuit passes through conductors 1, 2,and 3 tothe coil b of relay 6, conductor 4, armature c of relay 0,conductor 5, winding (1 of induction-coil d, conductor b, short spring Aof jack A ti -termina A of the plug A, conductors .6 and 7, winding ofrelay e, conductor 8, ring A of plug A, spring A of jack A conductor bwinding of of inductioncoil (1 conductor 9, armature c of relay 0,

conductor 10, winding-btof relay 1), and conductors 12 and 13 back tothe battery. This attracts the armature e of relay 6 at the station M,thus closing the circuit through the supervisory signal M at station M.It also causes the attraction of the armature b 'of the relay b, therebyclosing a circuit through conductors 1, 2, and 2, armature g of relay.

conductor 14, armature b and conductors 7 '12 and 13 back to the batteryB, thus lighting the supervisory lamp N at station The lighting of thelampN notifies the operator at station N that connection has been,

jack C? on the single-party line, which is representedas leading tostation 500. Upon theinsertionof the plugin the jack the usual localcircuit is closed through the sleeve C and-frame C this circuitincluding a wind-' ing it upon a'relayh, the winding of ,the relay g,and :the winding of the cutofi relay k.

This-energizesthe cut-ofl' relay 7c and the relay g, but does not causethe operation of the armature h of relay h, since "the coil 71? ismerely a retaining-coil, the purpose of which will be hereinafter.described in-"connect-ion with the selective signaling'of a four-partyline. The energization of therelay 9 causes the armatures g3, y 9, andgto be attracted,

the-attraction of the armature g breaking the-circuit through thesupervisorylamp N 2 and retiring this'signal. At the same timethearmature g establishes a circuit through the lamp N which is underthe control of relays b and c, as will be hereinafter described.

The signal to the called subscriber is underthe control of the operatorat station M, the selection of the signal, however, in connection withparty-lines. being under the control of the operator at station N, aswill be hereinafter described. In signaling the called subscriber theoperator at station M presses the key In, thereby connecting theterminals of a generator m to the conductors b and 11 respectively, thegeneratorcurrent in this case, however, being utilized not for directsignaling, but for controlling circuits at station N, whereby a signalis sent to the proper subscriberfrom the generator at the latterstation. It is' to be understood, of course, that the signalinggeneratorat-station-M is merely used for convenience in this connection, so thatthe same key can be used for direct signaling, if desired. So far asrelates to the operations at station N any other source of current underthe control of the operator at station M would answer the purposeequallywell. Starting with the conductor b the circuit from the sourceof current or generator m may be traced to the winding d fo't theinduction-coild", after passing through'which it divides, one branchleading and the receiver taken down.

directly through the condenser it and winding (2 back to the generatorthrough the conductor 1), another branch leading through condenser o,conductor 15, and relay 7),

through the coil (1 to conductor 1), 850., while still a third path forthe current is afforded through conductor 9, armature a, conductor 10,winding 1), conductor 12, conductor 13, battery 13, conductors 1, 2, and3, winding b conductor 4, armature c conductor 5, winding (1 of theinduction-coil d, and conductor b. The latter or third circuit is,however, only momentarily closed and is at once superseded. by a circuitthrough battery B, which includes conductors 1 2 3, winding b conductor4, armature c conductor 40, ar mature c conductor 10, winding 6,conductors 12 and 13 to battery B. The second of the above-describedcircuits energizes relay p, thus maintaining the attraction of thearmature- -p while the last-named circuit through battery B maintainsthe attraction of the armature b The attraction of the armature p closesa circuit through the relayfrom the generator 1" over conductors 19 and-20 to thering C of the plug C and thence over the line and through thesignal at station 500 and back to the tip C of said plug, the conductors21 and 22, winding (1 of induction-coil d, and conductors 23 and 24 tothe generator.

Upon the release of the key m at station M the relay p becomesdeenergized, thus breaking the circuit through the relay 9 and releasingthe armature (1 so that the signaling-circuit to the called substationis broken, the release of the said armature also completing thetalking-circuit through the inductioncoil windings and battery. When thesubscriber at the substation takes down the receiver, therebyshort-circuiting the associatedbondenser and signal, the current in thetalking-circuit flows through the relays, thus causing the attraction ofthe armature s, which completes a circuit from battery B throughconductor 1, relay 0, conductor 16, armature s conductor 25, armature band conductors 12 and 13 back to the said battery. The consequentattraction of the armatures c and c breaks the circuit previouslv tracedthrough the relay. e at station M so that'the supervisory signal M isretired,

thus notifying the operator at said station that the proper connectionhas been made In order to maintain the armature-b of the relay 1)attracted for the purpose of controlling the signal N the armaturesc andc are arranged to close a circuit from the battery B,

including the windings of the relay I), this circuit being through theconductors 1', 2, 3, and 4, armatures c and connected together whenattracted. by the conductor 40, conductor 10, winling b, conductors 12and 13 back to the battery. The maintenance of the armature b isnecessary for the purpose of closing a circuit. through the su ervisory,signal N which circuit 18 control ed,

as will be hereinafter described, from the station M; prior to theremoval of the plug C from the jack at station N.

When the subscriber at the called substae tion hangs up the receiver,thereby cutting out the conductive connection between the two lines, therelay 3 becomes, deenergized, and the armature 8 thereof falls back,thus breaking the circuit through the relay 0, so

that the armatures c and c are released and return to theirbackcontacts. This reestablishes'the circuit through the con'chicto'rs .1,2,3, 4,'and 5, ,b, 6, 7, relay 6, &c., previously traced, and causes theattraction of the armature e, so that thesupervisory signal M isestablished- The operator at station M is ,thus informed thatconversation has been finished and removes the plug A from the jack AThis breaks the circuit through the relay 1), which circuit wasoriginally established at the first insertion of the plug and which hasbeen restored to its first closed cir-' cuit connections by thedeenergizing of the relay cdue to the hanging up of the receiver at thecalled'substation, as described. The relay 6 is thus finallycleenergizedfand the armature" b returns to its back contact, as shownin the drawings, thus connecting the conductor 12, -with,a' conductor'26, which completes a circuit through the supervisory lamp N 2including the conductors 1 2, armature g conductor 26, armature b andconductors 12 and'13. The supervisory signal tral stations; the relay 0when operating to control thesignal M also serving to control a circuitthrough the relay 1), so as to maintain the armature thereof in suchposition as to.

I control" the signal N so that the said signal will be responsive'tothe operation of withdrawing the plug from the jack at station M. Relay7) is energized when the plug A is first inserted atthe calling centralstation, thus closing a circuit which depends .for its, con

tinuity upon the denergization of relay 0.

'Relay 0 then becomes energized, but in so doing closes another-circuitthrough relay 1).-

Un'der these conditions while relay 6 is still in condition to controlthe signal N the relay operation of the relay 0, due'to the hanging upof the receiver, the circuit through the re- 'l'ay I) is the same asthat originally established upon the insertion of the plug A-at stationM and the plug Cat station N, sothat upon the removal of the plug A thesaid relay will be denergized, causing thesignal N r to be dis layed.

The ca ling and supervisory signaling sys tems above described ,may beutilized in connection with two and'four party lines at the same centraloffice, as welli'as with single-- party lines, the multi le-jack," orjack per. "station-system, being erein shown as emurpose. 1 In the CfLSGOf ISL two-paft'yli'neor example, the line shown ployed for the ashaving the'stations 501 and 502 located thereonspring-jacks havingreversed. connections are emplo ed, and the signals branched to roundrom the opposite sides of the line. in this case the operator at stationN has nothing to do except place the plug in the right jack of thetwoartylin'e' e called.

in order to select the substation to In the four-party-line thebellsbridgedv to ground on the same side of the line are arsitedirections, and in connection with the jacks of the four-party line akey it is em-,

- In the position shown in Fig. 2 the signal-' ing-current, the circuitfor which was previously traced in describing thesignaling of station500,is assumed to pass from the negative brush r of the generator 1" andconsists of negative impulses. quired has a signal which will respond tocurrent flowing in the opposite direction, as is .the case'withfstations504 and 506, the key't is employed and manipulated prior to the 111-sertion of the lug C in the proper jack, thus closing a loca circuitthrough the main coil of the relay h and causin the armature h thereofto be attracted. tarting from the positive brush or generator-pole-r inthis casethe ath of the positive signaling-current may e traced througharmature k of relay h, conductor 19, armature q? of relay g, conductor20, armature g, ring contactO of If the station re ranged to respond tocurrent flowing in oppo the switch-plug C, the long contact-s ring of ijacks 504 or 506*,as the casemay e,-and their corresponding mainconductors to the call-bell at .the'wanted substation, appropriatelyadjusted to respond to plus currents transmitted over onev or the otheroflsaid main conductors, the said bell, with its as'so-' ciatedresistance at, being connected in an earth branch of its main.conductor, thence by earth return and central-station conductors 23 and24 to the opposite brush or pole of the enerator. The circuit throughthe main coi of the relay h is broken upon the attraction of thearmature 9 when the plug C is inserted; but the supplemental coil h istherefore, that no further description is re- I quired.

It is to be understood, of course, that the drawing is a conventionalillustration of the system, the relays being shown where the control oftwo or more circuits is involved as provided with two or more armatures.In

. practice each relay may be and usually is provided with a singlearmature adapted to actuate such contacts as may be necessary for thecontrol of the several circuits.

In order to avoid any possibility of misunderstandmg, it may be statedthat the lowermost jack E of each set of jacks shown in the drawings isthe answering-jack for the line to which it belongs, the operation ofsaid answering-jacks not being referred to, since no noveltyis involved,the jacks bein shown simply to complete the illustration of the systemin genera What we claim is 1. In a telephone system, a calling centralstation; a called central station; a supervisory signal at the callingcentral station; a relay controlling the operation of said signal; acircuit-controller for said relay located at the called central station;a relay for said circuit-controller ;a circuit for said relay includingthe substation line-circuit a supervisory signal at the called centralstation; a circuitcontrolling relay therefor; a circuit for said relayincluding the calling central-station line-circuit, and a branch circuitthereof for said supervisory signal at the called station, theenergization of said circuit-controlling relay being maintained untilthe plug and. jack at the calling-station'have been separated.

2. In a telephone-exchange system, a callin central station; a source ofcurrent at said ca ling central station; a' called central station; asource of signaling-current at said cal-led central station; a circuitfor said source of signaling-current; a relay controlling the circuitfor said source of signaling-current a circuit for energizing saidrelay; a circuitcontrolling relay for said circuit; means for closing acircuit from the source of current at the calling central stationthrough said relay; a supervisory-si nal relay, the coils of which areincluded in t e same circuit, and a supervisory signal in a branch ofsaid circuit and controlled by said relay.

In a telephone-exchange system, a calling central station; a source ofcurrent at said calling central station; a called central station; asource of signaling-current at said called central station; a circuitfor said source of signaling-current; a relay controlling the circuitfor said source of signaling-current; a circuit for energizing saidrelay; a circuitcontrolling relay for said circuit; means for closing acircuit from the source of current at the calling central stationthrough said relay; a supervisory-signal relay, the coils of which areincluded in said circuit; a supervisory signal in a branch of saidcircuit and controlled by said relay a supervisory-signal relay at thecalling central station; a circuit-controller for I said relay locatedat the called central station and in operative relation with thecalledsubstation line-circuit; said first-named supervisory-signal relayand said controller cooperating to control the supervisory signals atthe two central stations.

4. In a telephone system, a calling central station; a called centralstation; a supervisory signal at the calling central station; a relaycontrolling the operation of said signal; a circuit-controller for saidrelay located at the called central station; a relay for saidcircuit-controller; a circuit for said relay including the substationline-circuit a supervisory signal at the called central station; acircuitcontrolling relay therefor; a circuit for said relay includingthe calling central-station line-circuit, and a branch circuit thereoffor said supervisory signal at the called station; the energization ofsaid circuit-controllin relay being maintained until the plug and ack atthe calling-station have been separated; and means for retiring saidlast-named si nal upon the insertion of the plug in the jac of thecalled subscribers line.

In testimony whereof We have signed our names to this specification, inthe presence of two subscribing witnesses, this 28th day of June, 1905.

JAMES G. WRAY. HERBERT T. GARDNER. WILLIAM G. KINTON.

Witnesses:

MARION A. REEVE, GEORGE E. CHIPMAN.

